Curate, connect, and discover
https://en.m.wikipedia.org/wiki/(DoDI)_6130.03,_2018,_section_5,_13f_and_14m
This page goes over some of the intersex conditions which prevents one from serving in the US Armed Forces. Pretty interesting, but the documents don't provide any explanations for why these specific conditions make one unfit to be a soldier, sailor, airman or marine sadly.
In the past Transgenderism was included under this section too, that was changed under the Obama administration. Not sure if the new Trump rules will put it back here or if it will be put somewhere else.